id summary reporter owner description type status component version resolution keywords cc guest host 10948 32bit Host is hanging when 64bit guest is starting slozenkov "Good day. I have installed VirtualBox 4.2 on my HP Probook 6465b (AMD Dual-Core A4-3310MX, 4 GB RAM) with Windows 7 Professional 32 bit. I have enabled Virtualization support in BIOS and CPUz shows that my processor support AMD-V technology. I have created virtual machine for 64bit guest (with enabled hardware virtualization, nested paging, IO APIC). But when I am launching 64bit guest my host system is hanging. It occurs for Windows or Linux guest with 64bit architecture. 32bit guests work fine. Early I have HP 6910 with Intel Core 2 DuoT9300 and this problem neve hapenned. Had anyone similar problems? Will be glad to help. Thanks" defect closed other VirtualBox 4.2.0 fixed Windows Windows